It's a bit more complicated. I'm measuring geographical distances so I'm using haversine

    from math import radians, cos, sin, asin, sqrt
    def distance(lat1: float, lon1: float, lat2: float, lon2: float) -> float:
        # taken from: https://stackoverflow.com/a/4913653/35364
        # convert decimal degrees to radians
        lon1 = radians(lon1)
        lon2 = radians(lon2)
        lat1 = radians(lat1)
        lat2 = radians(lat2)
        # haversine formula
        dlon = lon2 - lon1
        dlat = lat2 - lat1
        a = sin(dlat/2)**2 + cos(lat1) * cos(lat2) * sin(dlon/2)**2
        c = 2 * asin(sqrt(a))
        r = 6371008 # Average radius of earth in meters
        return c * r